<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script type="text/javascript">
			var name = undefined;
			// console.log(name);
			var sex = null;
			// console.log(sex);
			
			var NAME = "zhangsan";  //string
			NAME = 66;             //number
			NAME = true;           //boolean
			NAME = null;
			var t = typeof NAME;  //typeof(Name)
			
			console.log(t);
		</script>
	</head>
	<body>
	</body>
</html>
